Smoking

 COVID positive patients are defined as patients having at least one positive PCR or Antigen test for COVID-19 or one positive Antibody test for COVID-19 or patient has visits utilizing the ICD-10 U07.1 code for COVID-19.

• Patient EHR records are not always complete. Smoking status for this patient population was obtained from EHR records. There is no guarantee that the reported smoking status of a patient is accurate. The follow definitions were applied:

Never - patients whose EHR recorded Never smoked tobacco

Current or Former - patients whose EHR recorded any past or current smoking status

Unknown - patients whose EHR had no data on smoking status

• Severity of COVID-19 is a calculation based on multiple events recorded in a patients EHR during their medical visit. The severity score for each patient may be inaccurate due to missing information within the EHR. A patient will only be graded on Severity if they have a laboratory confirmed positive PCR or Antigen test. Below are the definitions of each Severity Category.

Mild - Patient has no record of Emergency Room visit or hospitalization for COVID-19

ED Visit (not admitted) - Patient had an Emergency Room (ER) visit for COVID-19 but we have no record of hospitalization(Inpatient) for COVID-19

Moderate Hospitalized - Patient was hospitalized (Inpatient visit) for COVID-19 AND did not receive ECMO OR Invasive Ventilation

Mortality - Patient records show a date of death

Severe Ventilation/ECMO/AKI - Patient was hospitalized for COVID-19 AND received Extracorporeal membrane oxygen (ECMO) OR received Invasive Ventilation

Unavailable - Patients who did not have a lab confirmed positive PCR or Antigen COVID test